CN104046916B - A kind of high strength cold-rolled electro-galvanizing tie and production method thereof - Google Patents
A kind of high strength cold-rolled electro-galvanizing tie and production method thereof Download PDFInfo
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- CN104046916B CN104046916B CN201410282087.6A CN201410282087A CN104046916B CN 104046916 B CN104046916 B CN 104046916B CN 201410282087 A CN201410282087 A CN 201410282087A CN 104046916 B CN104046916 B CN 104046916B
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Abstract
A kind of high strength cold-rolled electro-galvanizing tie, its component and wt% are: C:0.05 ~ 0.10%, Mn:0.40 ~ 1.0%, Si :≤0.010%, P :≤0.010%, S :≤0.010%, Ti:0.40 ~ 0.60%, Cr:0.30 ~ 0.70%, Ni:0.50 ~ 0.80%, Als:0.030 ~ 0.060%; Production stage: smelt also continuous casting and become base, and carry out conventional strand heating; Hot rolling; Conventional pickling; Carry out secondary cold-rolling and second annealing; System band.The thickness of product of the present invention is 1.0mm, tensile strength is not less than 1000MPa, unit elongation is not less than 10%, alternating bending frequency is no less than 10 times (R=5mm), the zinc coating that product surface generates one deck even compact, strong adhesion, thickness are 1.0 ~ 2.0 μm, is placed in room atmosphere environment, obvious corrosion did not occur in 150 days, plate shape is good, meets the requirement of precise paper-thin cold-rolled steel strip bailing completely.
Description
Technical field
The present invention relates to a kind of tie and production method thereof, belong to a kind of high strength cold-rolled electro-galvanizing tie and production method thereof particularly.
Background technology
High strength cold-rolled electro-galvanizing tie is a kind of deep processed product with high added value and broad mass market prospect, be mainly used in tying up precise paper-thin cold-rolled steel strip, generally should have features such as " thickness are 0.9 ~ 1.0mm; tensile strength is not less than 1000MPa; unit elongation is not less than 10%; alternating bending frequency is no less than 10 times (R=5mm), is placed in room atmosphere environment and obvious corrosion does not occur in 150 days ".
Precise paper-thin cold-rolled steel strip is mainly used in the manufacture of the electronic products such as diode, triode, button cell, LED support, the requirement of Surface Quality is very high, the defects such as cut, scratch, corrosion can not be had, when therefore tying up, need SC, its surface can not be destroyed.Common turn blue or paint tie due to surfaceness higher, rete is uneven, be easy to injure steel strip surface, and anti-corrosion capability is extremely limited during bundling, thus can not be used for tying up.
But, if adopt the high zinc-plated tie of surface property just likely to solve the problem.This is because zinc-plated tie anti-corrosion capability is strong, surface imperfection is less, and even zinc layer is good, and has certain gloss, can strengthen the aesthetic appearance of product.
With regard to zincincation, generally there are zinc coating, pot galvanize and electro-galvanizing three kinds.Wherein, zinc coating technics comparing is simple, and energy consumption is lower.But main what adopt is paint containing zinc powder, very difficultly during japanning accurately control zinc coating thickness, lack of homogeneity, zinc layers easily comes off, and then weakens the corrosion resisting property of product.Hot dip galvanizing process then easily forms industrial scale, and Zinc attachability is strong, good uniformity, corrosion resisting property are excellent.Meanwhile, hot galvanizing process has thermal treatment function concurrently, can regulate the mechanical property of product simultaneously.But, due to zinc-plated be carry out under 450 ° of about C high temperature, zinc layers forms speed, and thickness is comparatively large, causes zinc to consume higher, and cost increases.In addition, too thick zinc layers easily comes off, and not only can cause cassette tape, product surface also can be caused to crack, affect anti-corrosion capability.Comparatively speaking, electro-galvanizing carries out at normal temperatures, and energy consumption is lower.Meanwhile, by the thickness regulating current density just accurately can control zinc layers, reduce unnecessary zinc consumption, reduce production cost.In addition, coating is relatively thin, not easily comes off and ftractures, and surface is smoother also, less to the damage on coil of strip surface.
With regard to the production technique of tie, mainly contain three kinds of modes such as lead patenting+tempering, two-phase region quenching+tempering, cold rolling strengthening after annealing.Lead patenting+tempering process can ensure product performance, and industrial scale also can realize, but operation is very complicated, and energy consumption is comparatively large, and environmental pollution is serious, and country prohibites already.Two-phase region quenching+tempering technique is using water as quenchant, though its less pollution, because cooling power is comparatively strong, can causes larger internal stress, cause product easy to crack, make plate shape be difficult to be guaranteed.Although cold rolling strengthening post growth annealing is simple to operate, less pollution, energy consumption is lower, and in producing, cold rolling and annealing operation is often only carried out once, causes product mechanical property greatly to rely on raw material.Because middle production process not easily accurately controls, thus property regulation leeway is less.Meanwhile, switchboard shape is also not easy during rolling high-strength degree tie.
Because electro-galvanizing carries out at normal temperatures, such as can not anneal again after completing, quench, the subsequent heat treatment such as tempering, so the mechanical property of product depends on cold rolling feeds completely.Will realize the high strength of product, high-ductility and high tenacity, cold rolling feeds just must have good mechanical property simultaneously.Production process is except non-precision control, otherwise once cold rolling+once annealing often is difficult to ensure mechanical property and the plate shape of product.But, if adopt secondary cold-rolling+second annealing technique, just can solve the problem.This is because, by secondary cold-rolling, reasonably can distribute draft, protect milling train to greatest extent, reduce the loss of roll, thus ensure the plate shape of product.On the other hand, in conjunction with second annealing, the leeway regulating mechanical property can be increased again, and less pollution.
Through retrieval:
Publication number is zinc coating tie and the manufacture method thereof that the Chinese patent of CN101734422A discloses a kind of tensile strength >=800MPa.Raw material adopts conventional steel grade Q235B, and by once cold rolling, once annealing and zinc coating explained hereafter, to go out tensile strength be 800MPa, and unit elongation is the medium tenacity zinc coating tie of 6%.Because product strength is too low, product performance do not reach service requirements completely.Meanwhile, this technique is difficult to the thickness and the homogeneity that accurately control zinc layers, and the surface property of product is not good.In the present invention, adopt secondary cold-rolling, second annealing and galvanizing technique, both can ensure that product had good plate shape, excellent mechanical property and surface property, and also accurately can control zinc coating thickness, reduce unnecessary zinc consumption, reduce production cost.
Publication number is pot galvanize tie and the manufacture method thereof that the Chinese patent of CN103805853A discloses a kind of tensile strength >=980MPa.Raw material steel grade adopts following design: C:0.25 ~ 0.35%, Mn:0.80 ~ 1.60%, Si :≤0.010%, P :≤0.010%, S :≤0.010%, Ti:0.030 ~ 0.050%, Als:0.030 ~ 0.060%.The tensile strength of product is not less than 980MPa, and unit elongation is not less than 10%, and corrosion resisting property is good.But C content is higher in raw material steel grade, the sticking power of this meeting extreme influence zinc layers.Meanwhile, by pot galvanize process, zinc consumption is larger.In addition, produce as once cold rolling and an annealing process complete, make the plate shape of product be difficult to be ensured completely.In the present invention, adopt secondary cold-rolling, second annealing and galvanizing technique, both can ensure that product had good plate shape, excellent mechanical property and surface property, and also accurately can control zinc coating thickness, reduce unnecessary zinc consumption, reduce production cost.
Summary of the invention
The present invention is directed to the needs of precise paper-thin cold-rolled steel strip bailing, a kind of zinc coating even compact, strong adhesion are provided, not easily come off and ftracture, smooth surface, the high strength cold-rolled electro-galvanizing tie of good plate cut and production method thereof.
The application to achieve these goals, has carried out a large amount of tests and analysis, through optimized choice, adopts the raw material steel grade of interpolation a small amount of alloying element Ti, Cr, Ni and secondary cold-rolling, second annealing and galvanizing technique to produce.Here, add appropriate Ti, Cr, Ni in steel grade, to improve the intensity of product, strengthen solidity to corrosion; By secondary cold-rolling, second annealing and galvanizing technique, to ensure that product has excellent plate shape and surface property, increase the leeway regulating mechanical property.
Realize the measure of above-mentioned purpose:
A kind of high strength cold-rolled electro-galvanizing tie, its component and weight percent are: C:0.05 ~ 0.10%, Mn:0.40 ~ 1.0%, Si :≤0.010%, P :≤0.010%, S :≤0.010%, Ti:0.40 ~ 0.60%, Cr:0.30 ~ 0.70%, Ni:0.50 ~ 0.80%, Als:0.030 ~ 0.060%, all the other are Fe and inevitable impurity.
Produce a kind of method of high strength cold-rolled electro-galvanizing tie, its step:
1) smelt also continuous casting and become base, and carry out conventional strand heating;
2) hot rolling is carried out:
A, carry out roughing, controlling roughing start rolling temperature is 1140 ~ 1220 ° of C;
B, carry out finish rolling, controlling finish rolling finishing temperature is 1070 ~ 1120 ° of C;
C, batch, controlling coiling temperature is 640 ~ 670 ° of C; After batching, hot-rolled steel sheet gauge control is 2.7 ± 0.1mm;
3) carry out conventional pickling, make surface of steel plate non-oxidation iron sheet;
4) carry out cold rolling:
A, carry out first time cold rolling and conventional degreasing, adopt 5 passage repeat-rollings, controlling total reduction is 45 ~ 51%, and it is 1.40 ± 0.01mm that controlled rolling terminates thickness;
B, carry out first time annealing, control annealing temperature at 680 ~ 720 ° of C, soaking time is 40 ~ 60min;
C, carry out the cold rolling and conventional degreasing of second time, adopt 2 passage repeat-rollings to product thickness 1.00 ± 0.01mm, controlling total reduction is 27 ~ 30%;
D, carry out second time annealing, control annealing temperature be 630 ~ 670 ° of C, soaking time is 30 ~ 50min;
5) system band is carried out:
A, through second time annealing after cold-rolled steel sheet uncoiling after carry out itemize and fin cutting;
B, under 20 ~ 30 ° of C, carry out electro-galvanizing, control current density is 10 ~ 20A/dm
2;
C, carry out conventional water wash and dry;
D, carry out conventional passivation process;
E, again carry out conventional water wash and dry;
F, routine are batched.
The effect of each element and master operation in the present invention:
Carbon: carbon (C) is the important element affecting tie mechanical property, in general, C content is higher than 0.10%, and the intensity of tie and hardness are also higher, but fragility also increases thereupon, and corrosion resisting property also can decline simultaneously.C content, lower than 0.05%, is difficult to again the intensity and the hardness that ensure product.Therefore, in the present invention, C content requires to control 0.05 ~ 0.10%.
Manganese: manganese (Mn) is the beneficial element in steel, as reductor, effectively can remove the oxygen in molten steel.Meanwhile, be combined by the sulphur in molten steel and form manganese sulfide, eliminate the harmful effect of sulphur in steel to a great extent.But Mn content is higher than 1.0%, will plasticity and the toughness of tie be reduced, and cause production cost to rise.Mn content is lower than 0.40%, and the effect of deoxidation and sulphur removal becomes not good.Therefore, in the present invention, Mn content requirement controls 0.40 ~ 1.0%.
Silicon: silicon (Si) is also the beneficial element in steel, has very strong solution strengthening effect, can improve intensity and the hardness of tie.But Si content is too high, the plasticity and toughness that make tie is significantly declined, has a strong impact on product surface quality simultaneously.Si content is too low, will weaken strengthening effect, affects intensity and the hardness of product.Therefore, in the present invention, Si content requirement controls≤0.010%.
Phosphorus: phosphorus (P) is the harmful element in steel, easily causes serious segregation, reduces the toughness of tie, causes brittle failure occurs.In addition, too high P content, by significantly reducing the welding property of tie, generally should give removal.Therefore, in the present invention, P content requirement controls≤0.010%.
Sulphur: sulphur (S) is the harmful element in steel, easily causes hot-short, reduces the toughness of tie, and seriously undermines the welding property of tie, generally should give removal.Therefore, in the present invention, S content requirement controls≤0.010%.
Titanium, chromium, nickel: titanium (Ti), chromium (Cr), nickel (Ni), as alloying element, can improve the intensity of product, strengthen solidity to corrosion.Content is too low, does not have due effect.Content is too high, then production cost can be caused greatly to increase, and worsen plate property.Therefore, in the present invention, Ti content requirement controls to control to control 0.50 ~ 0.80% in 0.30 ~ 0.70%, Ni content requirement in 0.40 ~ 0.60%, Cr content requirement.
Aluminium: aluminium (Al) is the beneficial element in steel, can crystal grain thinning as reductor, improves the toughness of tie.Therefore, in the present invention, Al content requirement controls 0.030 ~ 0.060%.
Cold rolling process
Because product thickness is 1.0mm, tensile strength is not less than 1000MPa, adopts conventional once cold rolling+annealing process to be difficult to ensure plate shape and the mechanical property of product, and makes the working load of milling train and roll comparatively large, and loss increases.For solving the problem, in the present invention, adopt secondary cold-rolling+second annealing technique.Cold rolling employing 5 passage repeat-rolling for the first time, total reduction is 45 ~ 51%.First time, the temperature of annealing was 680 ~ 720 ° of C, and soaking time is 40 ~ 60min.The cold rolling employing 2 passage repeat-rolling of second time, total reduction is 27 ~ 30%.The temperature of second time annealing is 630 ~ 670 ° of C, and soaking time is 30 ~ 50min.Why adopt this technique, be because this technique reasonably can distribute draft, protect milling train to greatest extent, reduce the loss of roll, thus ensure the plate shape of product.The leeway regulating mechanical property can be increased again, and less pollution.
System band operation
Uncoiling, itemize after fin cutting, carry out electro-galvanizing is completed at second time annealing cold-rolled steel sheet.Here, electro-galvanizing operation completes under normal temperature 20 ~ 30 ° of C, adopts ZnCl
2acid electroplating liquid, control zinc coating thickness by controlling current density, current density is 10 ~ 20A/dm
2.After plating, adopt chromic salt to carry out passivation, strengthen the anti-corrosion capability of zinc layers.Why adopting this technique, is that energy consumption is lower because electro-galvanizing carries out at normal temperatures.Meanwhile, by the thickness regulating current density accurately can control zinc layers, reduce unnecessary zinc consumption, reduce production cost.In addition, coating is relatively thin, not easily comes off and ftractures, and surface is smoother also, less to the damage on coil of strip surface.
Compared with existing common tie, the thickness of product of the present invention is 1.0mm, tensile strength is not less than 1000MPa, unit elongation is not less than 10%, and alternating bending frequency is no less than 10 times (R=5mm), the zinc coating that product surface generates one deck even compact, strong adhesion, thickness are 1.0 ~ 2.0 μm, be placed in room atmosphere environment, obvious corrosion did not occur in 150 days, plate shape is good, meets the requirement of precise paper-thin cold-rolled steel strip bailing completely.
Embodiment
Below the present invention is described in detail:
Table 1 is the chemical composition list of various embodiments of the present invention and comparative example;
Table 2 is rolling and the heat treatment process parameter list of various embodiments of the present invention and comparative example;
Table 3 is galvanizing technique parameter and the list of mechanical property situation of various embodiments of the present invention and comparative example;
Table 4 is the corrosion resisting property situation list of various embodiments of the present invention and comparative example.
Various embodiments of the present invention are produced according to following steps:
1) smelt also continuous casting and become base, and carry out conventional strand heating;
2) hot rolling is carried out:
A, carry out roughing, controlling roughing start rolling temperature is 1140 ~ 1220 ° of C;
B, carry out finish rolling, controlling finish rolling finishing temperature is 1070 ~ 1120 ° of C;
C, batch, controlling coiling temperature is 640 ~ 670 ° of C; After batching, hot-rolled steel sheet gauge control is 2.7 ± 0.1mm;
3) carry out conventional pickling, make surface of steel plate non-oxidation iron sheet;
4) carry out cold rolling:
A, carry out first time cold rolling and conventional degreasing, adopt 5 passage repeat-rollings, controlling total reduction is 45 ~ 51%, and it is 1.40 ± 0.01mm that controlled rolling terminates thickness;
B, carry out first time annealing, control annealing temperature at 680 ~ 720 ° of C, soaking time is 40 ~ 60min;
C, carry out the cold rolling and conventional degreasing of second time, adopt 2 passage repeat-rollings to product thickness 1.00 ± 0.01mm, controlling total reduction is 27 ~ 30%;
D, carry out second time annealing, control annealing temperature be 630 ~ 670 ° of C, soaking time is 30 ~ 50min;
5) system band is carried out:
A, through second time annealing after cold-rolled steel sheet uncoiling after carry out itemize and fin cutting;
B, under 20 ~ 30 ° of C, carry out electro-galvanizing, control current density is 10 ~ 20A/dm
2;
C, carry out conventional water wash and dry;
D, carry out conventional passivation process;
E, again carry out conventional water wash and dry;
F, routine are batched.
The chemical composition (wt%) of table 1 various embodiments of the present invention and comparative example
The rolling of table 2 various embodiments of the present invention and comparative example and heat treatment process parameter
The galvanizing technique parameter of table 3 various embodiments of the present invention and comparative example and mechanical property
The corrosion resisting property of table 4 various embodiments of the present invention and comparative example
As can be seen from table 3 and table 4, the tie of the present patent application, its tensile strength is 1000 ~ 1030MPa; Unit elongation is 10 ~ 11.5%; Alternating bending frequency (R=5mm) is 10 ~ 12 times; Zinc coating thickness is 1.0 ~ 2.0 μm.When temperature 23 ~ 28 ° of C, relative humidity 40 ~ 50%, open-assembly time 150d, there is not obvious corrosion in surface.Product performance meet service requirements completely.
Above-described embodiment is only the best and exemplifies, and is not the restriction to embodiments of the present invention.
Claims (1)
1. a production method for high strength cold-rolled electro-galvanizing tie, its step:
1) smelt also continuous casting and become base, and carry out conventional strand heating; The component of described strand and weight percent are: C:0.05 ~ 0.10%, Mn:0.40 ~ 1.0%, Si :≤0.010%, P :≤0.010%, S :≤0.010%, Ti:0.40 ~ 0.60%, Cr:0.30 ~ 0.70%, Ni:0.50 ~ 0.80%, Als:0.030 ~ 0.060%, all the other are Fe and inevitable impurity;
2) hot rolling is carried out:
A, carry out roughing, controlling roughing start rolling temperature is 1140 ~ 1220 ° of C;
B, carry out finish rolling, controlling finish rolling finishing temperature is 1070 ~ 1120 ° of C;
C, batch, controlling coiling temperature is 640 ~ 670 ° of C; After batching, hot-rolled steel sheet gauge control is 2.7 ± 0.1mm;
3) carry out conventional pickling, make surface of steel plate non-oxidation iron sheet;
4) carry out cold rolling:
A, carry out first time cold rolling and conventional degreasing, adopt 5 passage repeat-rollings, controlling total reduction is 45 ~ 51%, and it is 1.40 ± 0.01mm that controlled rolling terminates thickness;
B, carry out first time annealing, control annealing temperature at 680 ~ 720 ° of C, soaking time is 40 ~ 60min;
C, carry out the cold rolling and conventional degreasing of second time, adopt 2 passage repeat-rollings to product thickness 1.00 ± 0.01mm, controlling total reduction is 27 ~ 30%;
D, carry out second time annealing, control annealing temperature be 630 ~ 670 ° of C, soaking time is 30 ~ 50min;
5) system band is carried out:
A, through second time annealing after cold-rolled steel sheet uncoiling after carry out itemize and fin cutting;
B, under 20 ~ 30 ° of C, carry out electro-galvanizing, control current density is 10 ~ 20A/dm
2;
C, carry out conventional water wash and dry;
D, carry out conventional passivation process;
E, again carry out conventional water wash and dry;
F, routine are batched.
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| CN201410282087.6A CN104046916B (en) | 2014-06-23 | 2014-06-23 | A kind of high strength cold-rolled electro-galvanizing tie and production method thereof |
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| CN201410282087.6A CN104046916B (en) | 2014-06-23 | 2014-06-23 | A kind of high strength cold-rolled electro-galvanizing tie and production method thereof |
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| CN104046916B true CN104046916B (en) | 2016-02-03 |
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| CN104790005B (en) * | 2015-03-13 | 2017-03-22 | 武汉钢铁(集团)公司 | Production method of ultrathin high-performance Zn-Ni-Cr composite plated tie for restricted space |
| CN104862592A (en) * | 2015-06-18 | 2015-08-26 | 武汉钢铁(集团)公司 | Super deep-draw fingerprint resistant electro-galvanized plate and manufacturing method thereof |
| CN105057586A (en) * | 2015-08-07 | 2015-11-18 | 昆山—邦泰汽车零部件制造有限公司 | Method for manufacturing automobile hardware |
| CN105063696A (en) * | 2015-08-07 | 2015-11-18 | 昆山—邦泰汽车零部件制造有限公司 | Manufacturing method of abrasion-proof automotive hardware |
| CN106756698A (en) * | 2016-11-18 | 2017-05-31 | 淮北智淮科技有限公司 | A kind of hot dip galvanizing production process |
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| CN103436680A (en) * | 2013-08-26 | 2013-12-11 | 武汉钢铁(集团)公司 | Method for producing steel for binding straps with tensile strength of more than or equal to 990 MPa |
| CN103820725A (en) * | 2014-03-05 | 2014-05-28 | 武汉钢铁(集团)公司 | Binding strap with the thickness of 1.2 mm for high-temperature annealing and manufacturing method of binding strap |
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| JPS5976828A (en) * | 1982-10-25 | 1984-05-02 | Kawasaki Steel Corp | Production of cold rolled steel sheet by continuous annealing |
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|---|---|---|---|---|
| CN103436680A (en) * | 2013-08-26 | 2013-12-11 | 武汉钢铁(集团)公司 | Method for producing steel for binding straps with tensile strength of more than or equal to 990 MPa |
| CN103820725A (en) * | 2014-03-05 | 2014-05-28 | 武汉钢铁(集团)公司 | Binding strap with the thickness of 1.2 mm for high-temperature annealing and manufacturing method of binding strap |
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Effective date of registration: 20170711 Address after: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2 Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang Patentee before: Wuhan Iron & Steel (Group) Corp. |
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